678826831 has 2 divisors, whose sum is σ = 678826832. Its totient is φ = 678826830.

The previous prime is 678826823. The next prime is 678826843. The reversal of 678826831 is 138628876.

678826831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 678826831 - 2³ = 678826823 is a prime.

It is a super-2 number, since 2×678826831² = 921611732971005122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678826861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339413415 + 339413416.

It is an arithmetic number, because the mean of its divisors is an integer number (339413416).

Almost surely, 2^678826831 is an apocalyptic number.

678826831 is a deficient number, since it is larger than the sum of its proper divisors (1).

678826831 is an equidigital number, since it uses as much as digits as its factorization.

678826831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 774144, while the sum is 49.

The square root of 678826831 is about 26054.3054215613. The cubic root of 678826831 is about 878.8599350667.

The spelling of 678826831 in words is "six hundred seventy-eight million, eight hundred twenty-six thousand, eight hundred thirty-one".